Pyracmonite
A valid IMA mineral species
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About Pyracmonite
Formula:
(NH4)3Fe(SO4)3
Colour:
colorless to white
Lustre:
Vitreous
Specific Gravity:
2.22
Crystal System:
Trigonal
Name:
The name is after the Greek words πνρ = “fire” and ακμων = “anvil”; it recalls the mythical Hephaistos’s workshop, which allegedly was located on the Island of Vulcano
Closely related to aluminopyracmonite (chemically, the Al analogue). Also chemically related to sabieite and ferroefremovite. The ammonium analogue of 'Unnamed (Na-Fe Sulphate)' (both trigonal but not isostructural).
Well-known also as a synthetic compound.
Well-known also as a synthetic compound.
Unique Identifiers
Mindat ID:
38828
Long-form identifier:
mindat:1:1:38828:7
IMA Classification of Pyracmonite
Approved
IMA Formula:
(N3-H4)3Fe3+(S6+O4)3
Approval year:
2008
First published:
2010
Classification of Pyracmonite
7.AC.08
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
28.4.6.1
28 : ANHYDROUS ACID AND NORMAL SULFATES
4 : Miscellaneous
28 : ANHYDROUS ACID AND NORMAL SULFATES
4 : Miscellaneous
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Pyr | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Pyracmonite
Vitreous
Transparency:
Transparent
Colour:
Colorless to white
Streak:
White
Cleavage:
None Observed
Fracture:
None observed
Density:
2.22(1) g/cm3 (Measured) 2.228 g/cm3 (Calculated)
Optical Data of Pyracmonite
Type:
Uniaxial
Comments:
Average RI = 1.562
Chemistry of Pyracmonite
Mindat Formula:
(NH4)3Fe(SO4)3
Element Weights:
Crystallography of Pyracmonite
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3c
Cell Parameters:
a = 15.2171(14) Å, c = 8.9323(8) Å
Ratio:
a:c = 1 : 0.587
Unit Cell V:
1,791.26 ų (Calculated from Unit Cell)
Z:
6
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0006332 | Pyracmonite | Demartin F, Gramaccioli C M, Campostrini I (2010) Pyracmonite, (NH4)3Fe(SO4)3, a new ammonium iron sulfate from La Fossa crater, Vulcano, Aeolian Islands, Italy The Canadian Mineralogist 48 307-313 | 2010 | La Fossa crater, Vulcano, Aeolian Islands, Italy | 0 | 293 | |
| 0009422 | Pyracmonite | Palmer K J, Wong R Y, Lee K S (1972) The crystal structure of ferric ammonium sulfate trihydrate, FeNH4(SO4)2*3H2O Acta Crystallographica B28 236-241 |  | 1972 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.596 Å | (100) |
| 4.384 Å | (5) |
| 4.358 Å | (23) |
| 4.247 Å | (5) |
| 3.371 Å | (26) |
| 3.320 Å | (30) |
| 2.863 Å | (8) |
| 2.829 Å | (14) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] | |
| 45b : [Other oxidized fumarolic minerals] | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 50 : Coal and/or oil shale minerals | <0.36 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Pyracmonite
General Appearance of Type Material:
aggregates of colorless to white elongate hexagonal prismatic crystals up to 0.2 mm in length
Place of Conservation of Type Material:
Reference Collection of the Dipartimento di Chimica Strutturale e Stereochimica Inorganica, Università degli Studi di Milano, specimen number 2008–04.
Geological Setting of Type Material:
medium-temperature (~250°C) intracrater fumarole developed on a pyroclastic breccia
Associated Minerals at Type Locality:
Synonyms of Pyracmonite
Other Language Names for Pyracmonite
Dutch:Pyracmoniet
German:Pyracmonit
Common Associates
Associations Based on Photo Data:
| 2 photos of Pyracmonite associated with Efremovite | (NH4)2Mg2(SO4)3 |
| 1 photo of Pyracmonite associated with Alunite | KAl3(SO4)2(OH)6 |
| 1 photo of Pyracmonite associated with Szomolnokite | FeSO4 · H2O |
| 1 photo of Pyracmonite associated with Ammonioalunite | (NH4)Al3(SO4)2(OH)6 |
Related Minerals - Strunz-mindat Grouping
| 7.AC. | Aluminopyracmonite | (NH4)3Al(SO4)3 |
| 7.AC. | Amgaite | Tl+32Te6+O6 |
| 7.AC.05 | Vanthoffite | Na6Mg(SO4)4 |
| 7.AC.10 | Langbeinite | K2Mg2(SO4)3 |
| 7.AC.10 | Efremovite | (NH4)2Mg2(SO4)3 |
| 7.AC.10 | Ferroefremovite | (NH4)2Fe2+2(SO4)3 |
| 7.AC.10 | Manganolangbeinite | K2Mn2(SO4)3 |
| 7.AC.15 | Yavapaiite | KFe3+(S6+O4)2 |
| 7.AC.15 | Eldfellite | NaFe3+(SO4)2 |
| 7.AC.20 | Sabieite | (NH4)Fe3+(SO4)2 |
| 7.AC.20 | Godovikovite | (NH4)Al(SO4)2 |
| 7.AC.20 | Steklite | KAl(SO4)2 |
| 7.AC.35 | Aphthitalite | K3Na(SO4)2 |
| 7.AC.35 | Belomarinaite | KNa(SO4) |
| 7.AC.35 | Natroaphthitalite | KNa3(SO4)2 |
| 7.AC.35 | Möhnite | (NH4)K2Na(SO4)2 |
| 7.AC.40 | Itelmenite | Na4Mg3Cu3(SO4)8 |
| 7.AC.45 | Saranchinaite | Na2Cu(SO4)2 |
| 7.AC.50 | Majzlanite | K2Na(ZnNa)Ca(SO4)4 |
| 7.AC.60 | Philoxenite | (K,Na,Pb)4(Na,Ca)2(Mg,Cu)3(Fe3+0.5Al0.5)(SO4)8 |
| 7.AC.75 | Petrovite | Na12Cu2(SO4)8 |
Fluorescence of Pyracmonite
none
Other Information
Notes:
The mineral is not hygroscopic and is stable in air
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Pyracmonite
mindat.org URL:
https://www.mindat.org/min-38828.html
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References for Pyracmonite
Localities for Pyracmonite
Showing 10 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Matýsek et al. (2022) |
| Košek (2018) +1 other reference | |
Germany | |
| Blaß et al. (1993) +1 other reference |
| Witzke (1990) +1 other reference |
Hungary | |
| Collector:G.Koller |
Italy (TL) | |
| Demartin et al. (2010) |
Poland | |
| Ł. Kruszewski (PXRD data) |
| Kruszewski et al. (2020) |
USA | |
| Kampf et al. (2024) |
| Richards et al. (2017) |
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Pécs-Vasas, Pécs District, Baranya County, Hungary